RFR: 8293883: Add test/.classpath (Eclipse)

[Andy Goryachev]

On Thu, 22 Sep 2022 19:54:41 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

> There are sources under `tests/performance` and `tests/manual` that should also be included in the classpath.

I would like to limit the scope of this PR.  

The problem is that one thing leads to another - and the fact that all these manual tests are using the default package instead of their own individual packages might lead to issues and/or require more time and attention.

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PR: https://git.openjdk.org/jfx/pull/901